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(Sanguis Trimeresurus / Black Snake) Sweet, neutral, non-toxic. Those with a sword-like dorsal ridge and fine tail are superior; avoid contact with iron tools.

Invention: Snakes possess properties primarily directed at dispelling wind. Since black corresponds to Water in the Five Phases, they treat various stubborn bi-syndromes caused by wind, skin insensibility, wind-induced pruritic urticaria (feng sao yin zhen), tinea, hot-toxin sores, and conditions such as loss of eyebrows and beard accompanied by itching. However, Baihua She (Bungarus multicinctus) primarily treats wind affecting the Lung organ and is the specific drug for vitiligo (bai dian feng). Wushao She (Zaocys dhumnades) primarily treats wind affecting the Kidney organ and is the specific drug for erythrasma/vitiligo variegatus (zi dian feng). Their therapeutic indications differ significantly, but Wushao She is gentle in nature and non-toxic.

(Meat of Agkistrodon / Viper) Extremely hot in nature; (Gallbladder of Agkistrodon) slightly cold and toxic.

Invention: All snakes are oviparous, but only the Agkistrodon (Fu She) breaks out from the mother's womb, possessing particularly fierce toxicity, hence its name. Its appearance differs markedly from other snakes: it has a short, thick body, a pointed snout, and an upturned nose, thus also called "Fan Bi She" (Reverse-Nose Snake). Some have head markings and red bodies like brocade patterns; others are yellow-black or blue-black with white spots; these are all Fu She. Some have flat heads, soil-colored bodies without markings; these are Tu Hui (Earth Viper), which is also a typo for " " due to similar character forms. Li Shizhen stated: Fu She is large, Hui is small, but their toxicity is identical. Ge Hong in *Baopuzi* stated: Among the many types of snakes, the Hui bites most urgently. Immediately cut away the flesh around the wound and throw it on the ground; the heat feels like burning, and after a moment the toxin is exhausted, allowing survival. Another type resembles a lizard, one or two chi long, is the Thousand-Year Fu She. After many years, legs grow, enabling it to jump onto trees to bite humans or itself. It hangs its head listening to human crying. Head and tail look similar, size like a laundry pestle. Commonly called "Wang Ban Gui" (Expectation of Coffin Board), implying that being bitten leads to certain death, necessitating preparation of coffin boards. Su Song recommended grinding equal parts of Asari Radix et Rhizoma (Xixin) and Realgar (Xionghuang) into powder, applying it inside the wound, changing 3-4 times daily. Also, place Trichosanthis Radix (Gualou Gen) and Cinnamomi Cortex powder (Guim) in a tube, seal tightly to prevent volatilization, wear it, and if bitten, apply immediately. *Yetan Weng Fang* records crushing Huangjing Ye (Celtis Leaf) for emergency application. These are all rescue methods. However, some utilize its toxicity to attack pathological toxins within the body. *Mingyi Bie Lu* records making wine with Fu She meat to treat leprosy (Lai Ji). Applying gallbladder juice to treat sores utilizes its insect-killing and toxin-attacking properties. I believe there are many drugs for attacking toxins and emergency rescue; why rely on this as an heterodox method? It may be preserved provisionally for reference in rescue scenarios.